Apparatus for locating images on screens



Aug. 14, 1951 F. WALLER ET AL APPARATUS FOR LOCATING IMAGES ON SCREENS 4Sheets-Sheet 1 Filed Dec.

Aug. 14, 1951 F. WALLER ET AL APPARATUS FOR LOCATING IMAGES 0N SCREENS 4Sheets-Sheet 2 Filed Dec. 14, 1946 FIGS.

INVgglTORS Mm M BY \R'm (\MQW Q WW; N w 9N9 ATTORNEYS FUDUUUDUDUD Aug.14, 1951 F. WALLER ET AL APPARATUS FOR LOCATING IMAGES ON SCREENS 4Sheets-Sheet 5 Filed Dec.

//////////////I//////IJ 3x MW MW m M m m m m Aug. -I4, 1951 F. WALLER ETAL 2,563,892

APPARATUS FOR LQCATING IMAGES ON SCREENS Filed Dec. 14, 1946 4Sheets-Sheet 4 'FIGIO. FJ

MA GN/F /C A T/OV CON TQOL MOTOQ VERT/CA L 63%? 0 4 MOTOR TPA N5 VEPS ESHIFT CON TQOL MOTOR L i IXVEN'IORS Patented Aug. 14, 1951 APPARATUS FORLOCATING IMAGES ON SCREENS Fred Waller, Huntington, N. Y., and WillisRobert Dresser, Long Hill, Conn.

Application December 14, 1946, Serial No. 716,344

14 Claims. (Cl. 8816.6)

This invention relates to motion picture projection and the invention isintended primarily for controlling the projection where several imagesare thrown on contiguous areas of the same screen. In such cases it isessential that the different images be located withgreat exactness sincethe composite images are seriously impaired if any one of the individualimages overlaps an adjacent image or does not completely fill itsintended area of the screen.

When a number of images are projected on a single large screen for thepurpose of producing a composite picture, it is usual to employdifferent projectors for projecting the respective images. Experiencehas shown that it is not sufficient to merely adjust the apparatusinitially for the correct correlation and magnification of the imagesfrom the difierent projectors, because the film is not entirely uniform.The location of the image on the film sometimes varies along the lengthof the film, and the actual dimensions of the film vary at times fromshrinkage and other causes that make both the image location andmagnification vary.

In its broadest aspects it is an object of this invention to provideimproved projection apparatus for motion picture film, and especiallyfor the projection of the individual images used to make up largercomposite images on screens of large area.

Another object is to control automatically the location of a projectedimage on a screen so as to maintain the position of the imagesubstantially unchanged regardless of variation in the relative positionof the image on the film. The control is preferably obtained by means oflight apertures in the film cooperating with photoelectric cells in theframe around the screen or adjacent the screen on which the image isprojected.

Any variation of the location of the image on the screen can becorrected either by moving the film or by moving the lens through whichthe images are projected. The mechanical difficulty met with in movingthe film is that the film can be guided accurately only at the regionswhere it is bent. Where the film is fiat it is not stifi enough to bepushed into different positions effectively. Moving the lens, therefore,makes possible more accurate location of the image.

When the lens is moved to compensate for variation in the position ofthe film image, the side edge of the image formed by the film gate isalso shifted unless some compensating means it v are provided. Thisinvention controls image location by moving the lens, but providesappara tus for moving the same film gate in the direction to prevent thelens movement from changing the location of the edges of the fieldillumi nated by the projected image.

Another object of the invention is to provide automatic control of themagnification of the film image of a motion picture film so that theimage fills a predetermined area of a screen regardless of variation inthe actual dimensions of the film frames.

In the preferred embodiment of the invention, automatic control of imagelocation and magnification are combined so as to maintain registrationof adjacent images and proper illumination of the full area of thescreen section that each image is intended to cover.

Other objects, features and advantages will appear or be pointed out asthe specification proceeds.

In the drawings, forming a part hereof, in which like referencecharacters indicate corresponding parts in all the views,

Figure 1 is a diagrammatic view illustrating the application of theinvention to the control of the location of an image on a single screen.Figure 2 is a detailed diagrammatic view showing the location of thephotocells used in the combination illustrated in Figure 1.

Figure 3 is a diagrammatic view illustrating the application of theinvention to the control of both the location and magnification of anumber of images projected from different films on a large-area screento form a composite picture.

Figure 4 is an enlarged detailed view of one of the films used in Figure3.

Figure 5 is a perspective, diagrammatic view of projection apparatus forcontrolling the location and magnification of the respective imagesprojected in Figure 3.

- Figures 6 to 9 are detail views of the compensating linkages used withthe projection apparatus of Figure 5.

Figure 10 is a wiring diagram showing the circuits by which thephotocell controls operate the motors of the apparatus illustrated inFigure 5.

Figure 1 shows a motion picture film H! which runs through projectionapparatus having a guide H for the left hand edge of the film. One filmframe 13 is illustrated, but it will be understood that the film has aplurality of successive frames. The film NJ has two light apertures l5and. i5

associated with each frame and located along the left hand margin of thefilm.

Light from a light source 18 passes through the film frame I3, andthrough the light aper tures l5 and is to a lens it which projects theimage of the film frame on a screen 25. The light passing through theapertures i5 and I6 is focused by the lens l9 on light responsive means22 and zs'respectively, located along one side of the screen 20, andpreferably embedded in a frame 25 that surrounds the screen 20.

The lens [9 is carried by a lense mount 2'! Wl'llCh'lS movablevertically in guides 28. The lens mount 2! is moved up and down in theguides 28 by a pinion 29 meshing with a rack 313 secured to one edge ofthe lens mount 21. I'he pinion 29 is driven by reduction gearing 32 froman electric motor 33 mounted on a base 34.

The base 34 is supported by guides 35 and isslidable horizontally alongthe guides 35, such horizontal movement being in a direction transverseof the light beam by which the film is projectedon the screen. The baseits is connectedwitha rack 33- driven by a pinion 39 from an; electricmotor as through reduction gearing 4|.

The electric motors 33 and 4!! are reversible and their direction ofmovement is controlled by relays. The motor 33 is connected with relaysA l and -45. These relays are operated by separate photocells 4! and.48, respectively, of the light responsive means 22.

When the image of the light aperture 15 strikes both of the photocellsll and 48 with equal intensity, both of the relays M and 35 are closedand. the: motor .33 remains stationary. When the image of the lightaperture I5 is high and concentrates illumination on the photocell 41,the relay 44 remains closed while the relay 45 opens and the motor 33moves the lens mount 2'! down until the photocells 4? and 48 are bothilluminated substantially equally and the image is restored to itsproper location. Downward move-- ment of the image of the light aperturel5; sov as to concentrate the illumination on the photocell J3 causesrelay 44- to open while relay 45 remains closed and energizes the motor33-to rotate in a direction to raise the lens mount 21 and restore theimage on the screen. to the desired location.

The operation and direction of rotation of the motor 40 is controlled byrelays 5i] and 55 con-= nected with photocells. 52 and 53 respectivelyof. the light responsive means 23. Shifting of the image of the light.aperture is so as to concentrate the illumination on only one of thephotocells 52 and 53. causes one or the other of the relays and 5! toopen while the. other remains closed and. causes the motor in tooperateto shift the base 34- and lens mount 21 a direction to restore the imageof the light aperture #6 to the desired location.

Figure 2 shows a construction in which the photocells M and 48 arelocated behind the frame 25 of the screen. A reflector is located inline.

with an opening 55. in the frame 25, and this reflector has. tworeflecting surfaces that are set at. an angle to. the axis of. theopening 56 so that one-half of the rays of light entering the opening.56v are reflected to the photocell 31. and the other half to thephotocell 48. The reflectin surfaces are preferably curved toconcentrate the light on the photocells i1 and i8.

Inpositioning the photocells, it. is advantageous tohave the longdimension of each hotocell 6 right angles to the direction of movementwhich the photocell controls. For example, in Figure 1, the photocells41 and 48 which control the vertical movement of the image arepositioned with their long dimensions extending horizontally. Thisorientation results in the most rapid change in illuminaton intensityfor a given displacement of. the control beam. Conversely, thephotocells 52 and 53, which control horizontal movement of the image,are positioned with their long dimensions extending vertically.

Figure. 3 shows a large screen having a center area E i and contiguousareas 65 and 66 on the left and right, respectively, of the center area64. This. screen isv surrounded by a frame 68. Images are projected onthe areas 64, B5 and 66 from separate projectors, which are representedin the drawing by an illustration of a film strip and lens. Frame imagesof a film H! are projected on the center screen area 64 through a lens II. The

screen area 65 is illuminated by the images of a film l2 projectedthrough a lense l3, and images on a film 1.4 are projected on the screenarea 55 through a lens 15. The images on the screen area 64 and 66 meetalong a line 1'! and the image on the center area 64 meets the image onthe right hand. area: 5&- along a line 18.

In order to have the different images on the screen of Figure 3 appearas a single picture it is essential that the. images from the respectiveprojectors be not only correctly located both horizontally andvertically so as to meet exactly along the lines Ti and 18, but it isalso essential that the images have the proper magnification so as tofill the intended areas of the screen. For example, if the film 1.9, orsome portion ofit, has shrunk so that the image of the film frame, as.projected. on the center section 64, is not quite wide enough tofill inthe distance between the. lines "H and "58, then image locatingapparatus, such as described in connection with Figure 1, cannot makethe image on. the center section register with the images on the areas65 and 66 at the same time.

This invention provides for automatic control of the magnification bylight responsive means which. cooperate with light apertures in thefilm. Such apparatus moves the projector lens toward or from the screento change the magnification and at the same time provides a constantfocus with a focus follow-up device similar to the focus controlconnections used on. conventional:

enlargers.

Figure 4 shows the film l0 on an enlarged scale. This film hasconventional apertures 80. for receiving the teeth of the film-drivingsprockets of the projector, but the film frames 8! are spaced so as toleave margins between them. In. these margins there are light apertures83, 84 and 85. Two of these apertures, for example. the apertures 34 and85, are used to control the location of the image, in the mannerdescribed in connection with Figure l, and the remaining" light aperture83 is used to control the magnification of the image. The reason forhaving the light apertures 83, 85- and 85' in the margin between thefilm frames 8| is that it permits thev light responsive devices, withwhich these light apertures cooperate, to be. located in the frame of ascreen used for composite pictures, as in Figure 3.

The light responsive means on which the images of the light apertures83, B4 and 85 are thrown are indicated in Figure 3 bythe. referencecharacters 81., 8,8 and 8 9 respectively. Similar light responsive meansare located in the frame 68 under the Screen areas 69 and 66.

Figure 5 is a diagrammatic showing of the projection apparatus used forprojecting the film I9 in Figure 3. Similar projection apparatus is usedfor each of the films I2 and I4. Much of the apparatus shown in Figure 5is the same as shown in Figure l, and is designated by the samereference characters, but the motor and adjusting mechanism in theapparatus of Figure 5 are located on the opposite side of the lens fromthe structure shown in Figure 1.

The projection apparatus of Figure 5 includes, in addition to thestructure already described in connection with Figure l, a film gate 92that serves as a mask for determining the limits or marginal edges ofthe image projected on the screen. The film gate 92 is supported inguides 93 carried by a slide 94 which is movable horizontally in guides99. These guides 96 extend parallel to the guides 36; and the base 34 isconnected with the slide 94 by a linkage which causes the slide 94 tomove whenever the base 34 moves along its guides 35. The linkageconnecting the base 34 and slide 94 will be described in connection withFigures 8 and 9, and for the present it is sufiicient to understand thatthe slide 94 moves in the same direction as the base 34 but for alonger, and proportional, distance which is so correlated with themovement of the base 34 that the edges of the projected image, asdetermined by the edges of the opening through film gate 92, remain inthe same position on the screen in spite of horizontal movement of thelens I9.

The film gate 92 is movable vertically in the guides 93 and is supportedby a link 98 connected by other links with the lens mount 21. Thislinkage, will be described in connection with Figures 6 and '7 and forthe present it is suflicient to understand that vertical movement of thelens mount 21 in the guides 28 causes the film gate 92 to move up anddown in the guides 93 in the same direction as the movement of the lensmount 21 but for a distance greater than the movement of the lens and socorrelated with the movement of the lens that the edges of the projectedimage, as determined by the top and bottom edges of the film gate 92,are not influenced by the vertical movement of the lens I9.

The entire projector mechanism and lensadjusting apparatus is supportedon a base I99 which slides in guides I9I toward and from the screen. Arack I93 is attached to the base I99 and-meshes with a pinion I94 thatis driven by a motor I95 for moving the base I99 along its guides I9I.The movement of the base I99, along the guides I91 changes themagnification of the image. The lens I9 can be moved back and forth inthe lens mount 21 by any suitable focus follow control mechanism formaintaining the focus of the image in spite of changes in themagnification.

Figures 6 and '7 show the linkage between the film gate 92 and the lensmount 21. The film gate 92 has a yoke I98 at its upper end, and thisyoke I98 is connected with the link 98 by a pin I 99 extending through aslot H9 in the rearward end portion of the link 98.

The link 98 is suported from a bracket I I2 by a fulcrum pin I I3. Atthe forward end of the bracket II2 there is a yoke H5 with a pin IIBwhich serves as a fulcrum for another link I I I. Motion of the link Illis transmitted to the link 98 by a pin I29 which extends from one sideof the link 6 III into a slot I2I in the forward end portion of the link98.

The forward end of the link H1 is connected to the lens mount 2! by anintermediate link I 23. This intermediate link is secured to the lensmount 21 by a pivot connection I24 and the upper end of the intermediatelink I23 is connected with the link I I? by a pin I26 extending througha slot 21 in the forward end of the link I IT.

The lever arms of the link I I1 are substantially equal, and the leverarms of the link 98 are so related that the ratio of the length of theforward arm to the length of the longer rearward arm of the link 98 isequal to the ratio of the distance of the lens I9 from the screen to thedistance between the film and the screen. It is not necessary that thelink II? have arms of equal length and it is suflicient that theleverage of the compound lever system which connects the lens mount withthe film gate he so correlated with the distances between the lens andscreen, and the film and the screen, that the edges of the image on thescreen, as determined by the film gate, will not be moved as a result ofmovement of the len mount.

Since the respective distances of the lens and the film from the screendo not remain in the same ratio for all operating conditions of theprojector, it is preferable to have the leverage of the compound leversystem adjustable. The bracket I I2 is supported by a stand I28 which isrigidly secured to the base I99. The bracket H2 i movable alongthe standI28 as a guide toward and from the film gate 92 and lens mount 28. Thebracket II 2 is shifted by turning an adjusting screw I39 The adjustingscrew I39 is rotatable in a bear ing I92 which is part of the stand II2. This screw is held against axial movement with respect to the bearingI92 by collars on the screw. The forward end of the screw I39 threadsthrough a lug I34 connected to the bracket II2 for moving the bracketalong the stand I28. This movement of the bracket II2 does not distortconnections between the leverage system and the film gate 92 and lensmount 21 because the pins 199 and I26 extend through slots in the links98 and I IT. This forward or rearward adjustment of the bracket I I2does change the leverage of the system, however, since it changes theeifective lengths or" the forward lever arm of link I !I and therearward lever arm of link 98, and these changes are opposite to oneanother, that is, one lever arm gets shorter as the other gets longer,thus changing the leverage of the system.

Figures 8 and 9 show the linkage connecting the base 34 with the slide94. A stud I49 extends up from the slide 94 and through a slot MI in alink I42. This link I42 is movable angularly in a horizontal plane abouta fulcrum pin I44 secured to a bracket I45, and the links I42 and M1 areconnected by a pin I59 secured to the link I4! and extending through aslot I5I in the upper link I42. The forward end of the link 54! isslotted and a pin I49 extends through this slot and connects the linkwith the base 34.

The bracket I45 is slidable in guides I53 on the base I99, and can beadjusted by a screw I55 extending through a lug I56 which forms a partof the bracket I45. The screw I55 is held against axial displacement bycollars on opposite sides of a lug E5 of the projector base I99.

Adjustment of the screw I55 in Figures 8 and 9 moves the bracket M5 andchanges the leverage of the composite lever system by which the slide 7694 is connected with the base 34.

Figure 10 shows a wiring diagram for controlling the apparatusillustrated in Figure 5. Vertical movement of the lens mount for imagelocation is controlled by photoelectric cells ll and 48, and horizontalmovement of the lens and its sup= porting structure for image locationis controlled by photoelectric cells 52 and 53 as in the apparatus shownin Figure l. The third motor N35 for operating the magnification controlis connected with relays it! and H52 in the circuits of photo= cells I53and ie l respectively. As in the case of the image control motors, themotor i 95 does not run when light is supplied to both of the photo=cells E63 and its and the relays lfii and E62 are both closed. When thephotocell I63 only receives light, the motor N35 is operated in onedirection, and when the photocell ifi only receives light, the motor itsis operated in the opposite direction.

It will be understood that the film iii in Figure l is used with a filmgate, and that linkages such as shown in Figures to 9 are employed forpreventing movement of the edges of the illuminated field on the screenwhen the lens is is moved by the image locating controls.

The way in which the magnification control can be efiected by a singlepair of photocells is best understood by referring to Figure 3. Theimage location controls move the lens so that the images of the lightapertures es and 85 register with the light responsive devices 88 and89, and maintain the left-hand edge of the projected. image even withthe line ll. With the position of this line definitely located, themagnification of the image can be determined by the movement of theimage of the light aperture es. If this image falls to the right of thelight responsive means ill in Figure 3 the magnification is too great,and if it falls to the left of the light responsive means Bl, themagnification is insulficient. The magnification control circuit shownin Figure will operate the motor ltd and adjust the magnification untilthe image of the light aperture 83 registers with the light responsivemeans 8?.

The preferred embodiments of the invention which have been describedobtain image location by moving the lens, but the invention can bemodified to move the film, or the projector. Other changes andmodifications can be made and some features of the invention can be usedwithout others.

We claim:

1. The. combination with a motion picture projector having a lens andafilm gate that serves as a mask for determining the edges of the imageprojected on a screen, of image location control apparatus includingmechanism with light-responsive control means for automaticallyadjusting the lens vertically to cause a vertical shifting of the imageon a screen in response to vertical displacement of a control beamprojected from the film, other mechanism with lightresponsive controlmeans for automatically adjusting the lens horizontally to cause ahorizontal shifting of the image on the screen in response to horizontaldisplacement of a control beam projected from the film and compensatingconnections between the lens and the film gate for moving the film gatein such a correlation with the l ns movement that the margins of theimage on the screen, as determined by the film gate, remain unchangedwith different vertical and horizontal adjustments of the lens.

2. Projection apparatus including a lens mount,

supporting means for the lens mount movable to adjust the lensvertically, a film gate for determining the edges of an image projectedon a screen through a film located at the gate, and amotion-transmitting connection between said supporting means and thefilm gate for moving the film gate vertically and in the same directionas the vertical movement of the lens mount, but for a different verticaldistance from that moved by the lens mount.

3. Projection apparatus including a mount for a lens through which animage is projected on a screen, supporting means for the lens mountmovable to adjust the lens vertically, a film gate for determining theedges of an image projected on a screen through a film located at thegate, and a motion transmitting connection between said supporting meansand the film gate for moving the film gate vertically and in the samedirection as the vertical movement of the lens mount, said motiontransmitting connection being proportioned to move the film gate by adistance equal to the lens movement multiplied by the ratio of the gatespacing from the screen to the lens spacing from the screen.

4. Projection apparatus including a mount for a lens through which animage is projected on a screen, supporting means for the lens mountmovable to adjust the lens horizontally, a film gate for determining theedges of an image projected on a screen through a film located at thegate, and a motion transmitting connection between said supporting meansand the film gate for moving the film gate horizontally and in the samedirection as the horizontal movement of the lens mount, said motiontransmitting connection being proportioned to move the film gate by adistance equal to the lens movement multiplied by the ratio of the gatespacing from the screen to the lens spacing from the screen.

5. Projection apparatus including a mount for a lens through which animage is projected on a screen, supporting means for the lens mountmovable to adjust the lens vertically, other supporting means for thelens mount movable to adjust the lens horizontally, a film gate fordetermining the edges of an image projected on a screen through a filmlocated at the gate, supporting means on which the film gate is movablevertically, other supporting means for the film gate that are movablehorizontally, a motion transmitting connection between the supportingmeans that effect vertical movement of the lens mount and those on whichthe film gate is movable vertically, said motion transmittingconnections being constructed and arranged to cause vertical movement ofboth the lens mount and film gate in the same direction and with theextent of motion of the lens mount and film gate proportional to theratio of the gate spacing from the screen to the lens spacing from thescreen, and similar motion transmitting connections between thesupporting means that move horizontally for adjusting the film gate andlens mount, said similar motion transmitting connections being alsoproportioned to cause the movement of the lens mount and film gate to bein the ratio of the spacing of the lens mount and film gate from thescreen.

6. Projection apparatus including a lens mount, supporting means for thelens mount movable horizontally to adjust the position of the lens, afilm gate for determining the edges of a projected image, andmotion-transmitting connections between the film gate and the lens mount9 supporting means for moving the film gate horizontally in response tohorizontal movement of the lens mount, but for a difierent horizontaldistance from that moved by the lens mount.

7. Projection apparatus comprising a lens mount, supporting means forthe lens mount and with respect to which the lens mount is movable bothvertically and horizontally, a film gate for determining the limits ofthe image projected on a screen through a lens in said mount, motion- 1transmitting connections between the lens mount .and the film gate formoving the film gate vertically in response to vertical movement of thelens, and other motion-transmitting connections between the film gateand the lens mount for moving the film gate horizontally in response tohorizontal movement of the lens, both of said motion-transmittingconnections being constructed and arranged to move the film gate fordistances different from but correlated with the movement of the lens.

8. Projection apparatus including lens-supporting means movable to shiftthe lens both vertically and horizontally for controlling the locationof an image projected on a screen, a film gate that serves as a mask fordetermining the limits of the projected image, and motion-transmittingconnections between the film gate and lens-supporting means for movingthe film gate horizontally in response to horizontal movement of thelens, and vertically in response to vertical movement of the lens, saidmotion-transmitting connections being constructed and arranged to movethe film gate in the same direction to the movement of the lens and fora distance that is greater than the movement of the lens and that has apredetermined ratio to the lens movement.

9. Projection apparatus including a lens support movable to shift thelens horizontally and vertically for controlling the location of a projected image on a screen, a film gate that serves as a mask fordetermining the limits of the projected image, and motion-transmittingconnections between the lens support and the film gate for transmittingboth vertical and horizontal movement of the lens support to the filmgate, said motion-transmitting connections comprising a compound leversystem that moves the film gate down when the lens moves down and thatmoves the film gate horizontally in the same direction as the horizontalmovement of the lens, the lever arms of the compound lever system beingso proportioned that the ratio of the movement of the lens to themovement of the film gate is substantially equal to the ratio of thedistance between the film gate and the screen to the distance betweenthe lens and the screen.

10. Motion picture projection apparatus includingfiin combination, aguide along which a film is moved with intermittent motion, a lensthrough which an image of the film is projected on a screen, means forgiving the lens components of movement both vertically and horizontallyin directions transverse of the axis of the lens, said means including alens support, guideways in which the lens support is movable in thedirection of one of said components, a carriage by which the guidewaysare supported, other guideways on which the carriage is movable in thedirection of the other of said components, a motor for moving the lenssupport along the guideways, another motor for moving the carriage alongsaid other guideways, automatic control means for both of the motorsincluding light-sensitive devices that are in the path of lightprojected through control apertures of the film for operating the motorsto maintain images of the control apertures in a definite location andthus maintain the image of the film in a definite location on thescreen.

11. Motion picture projection apparatus for projecting an image thatconstitutes an area of a mosaic picture on a screen with at least oneedge of the image abutting another area of the mosaic picture, saidapparatus including a projector comprising a film gate, alens mount,apparatus for advancing a film, mechanism that moves a portion of theprojector in directions that change the location of the projected imagearea vertically on the screen, other mechanism for moving a portion ofthe projector in directions that change the location of the image areahorizontally on the screen, and separate control means for therespective mechanisms, said con- .trol means including light-responsivedevices located in front of the projector in the path of light projectedthrough the film.

12. Motion picture projection apparatus for projecting an image thatconstitutes an area of a mosaic picture on a screen with at least oneedge of the image abutting another area of the mosaic picture, saidapparatus including a projector comprising apparatus for advancing afilm, a film gate, a lens mount, supporting means for the film gate andlens mount constructed and arranged to provide relative movement of thefilm gate and lens mount both vertically and horizontally in directionstransverse of the axis of a lens in said lens mount to change thelocation of the projected image area and of the edges of the area bothvertically and horizontally, adjusting mechanism for producing therelative vertical movement of the film gate and lens mount, otheradjusting mechanism for producing the relative horizontal movement ofthe film gate and lens mount, separate electric motors for operatingeach of the adjusting mechanisms, control means for one motor includinga light responsive device, and control means for the other motorincluding a second light responsive device, both of the light responsivedevices being located in front of the path of light that is projectedthrough the film.

13. Apparatus for projecting an image that is to constitute an area of amosaic picture on a screen, which area abuts with another area along atleast one edge or" the image, said apparatus including a projectorcomprising parts through which a light beam passes between. the film andthe screen, said parts including a film gate and including also a lensmount that is movable transversely of the light beam in two angularlyrelated directions, apparatus for advancing a film, mechanism that movesthe lens mount with respect to both the film and film gate and acrossthe light beam in each of said two directions, motor means for operatingsaid mechanism, and automatic controls for the motor means includinglight sensitive devices located in front of the projector and in thepath of a portion of the light beam that is projected through the film.

14. Apparatus for projecting an image that is to constitute an area of amosaic picture on a screen, which area abuts with another area along atleast one edge of the image, said apparatus including a projectorcomprising parts through which a light beam passes between the film andthe screen, said parts including a film gate and a lens mount each or"which is independently mounted for movement with respect to the film,apparatus for advancing a film, mechanism that produces relativemovement of both the film gate and the lens mount with respect to thefilm in directions transverse of the direction of the light beam tochange the'iocation of the image on the screen with respect to the nextadjacent image of the mosaic picture, said mechanism including meansthat controls the extent of movement of thefilm gate with respect tothat of the lens mount, a motor for operating said mechanism andautomatic control'nieans for the motor incli ding lightsensitive deviceslocated adjacent to the screen and in the path of a beam of lightprojecteq through alight aperture in the film.

FRED WALLER.

WI I Q T DR S R- file of, this patent:

UNITED STATES PATENTS Niimlcer Name I Date chas jnu, A ig. 27,1395

N be

12 Name Date Frawley 'Mar. 27,1900 Wells"; Dec. 21,1915 Ki11man; f July20, 1920 Jenkins Aug. 3, 192.0 Bingham ai. 15, 192,1 Bingham j Oct. '4,1921 R e el J ms 14 Leventhal Feb} 27', 1923 Gaumont et a1. May. 15,I923 Cap'staff ar-1111324 Malm 44-" ADT T 93, Kosken 'May'2111929Simjian 1111.12; .932 Jackman July 16,1935 Ives 5.4 Aug. 20', 1935 C nord 4- Oct- 1193 Newman De'c.'10, 1935 Buria M r 1 9 St0ckb'arger" 'June11, 1940 Stockbarger. et a1.' N612. 5", I940 Gosswiller -,-j-, -.-1,-----1 Jan I, 946

